Refrigerator



FIG. 1 is a perspective view of a refrigerator showing our ornamental design;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a right view of FIG. 1;

FIG. 4 is a left view of FIG. 1;

FIG. 5 is an enlarged partial view taken from FIG. 4;

FIG. 6 is a top view of FIG. 1; and,

FIG. 7 is a bottom view of FIG. 1. 

The ornamental design for a refrigerator, as shown and described. 